Pressure-filter.



E. J. SWEETLAND. PRESSURE FILTER. APPLICATION FILED APR.12, 1913.

1,083,305. Patented Jan. 6, 1914.

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E. J. SWEETLAND. PRESSURE FILTER.

APPLICATION FILED APR. 12, 1913.

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Patented Jan. 6, 1914.

3 SHEETS-SHEET 2.

E. J. SWEETLAND.

PRESSURE FILTER. APPLICATION FILED APR. 12, 1913.

Patented Jan. 6, 1914.

3 SHEETS-SHEET 3.

UNITED STATES PATENT OFFICE.

ERNEST J. SWEETLAND, OF

Specification of Letters Patent.

MONZI-QLAIB, NEW JERSEY- ranssvaammna.

To all whom it may concern:

Be it known that I, ERNEST J. SWEET- LAND, a citizen'of the United States, resid-' ing in the town of Montclair, county of Essex, and State of New Jersey, have invented certain new and useful Improve-j ments in Pressure-Filters, of Which the following is a specification.

My invention relates tomeans for filter-g ing fluids of various kinds, particularly; While under pressure, and is largely con-i cerned with mechanism for quickly and Billciently causing the separation of sections of the shell for purposes of cleaning and thef like.

In carrying out my invention -I provide a filter of such construction that even yerylarge I units may be operated without manual labor; in discharging the residues and cleaning the filter plates, and one from which the residual filter cake may be discharged without the: aid of water, since in many localities thei use of water for sluicing the residues fromi filter presses is commerciallyimpracticable. I also provide a construction of great strength to Withstand internal pressure, which a plurality of bolts may be used to? lock the filter body in closed position, saidl bolts being adapted to operate in unison under the control of a single mechanism.

In the accompanying drawings which form a part of this specification, 'Figure 11 is an end elevation of the filter in closed pol sition, showing the hydraulic operating cylinders and means of supporting the filteri from above; Fig. 2 is a side elevation of the; filter, partly in section, the section being; taken on the vertical center line of Fig. 1;? Fig. 3 is a transverse sectional view of the; filter in position open for cleaning. showing? a portion of the filter cloth removed near the I top of the filter. leafto expose the screen which forms the inner structure of the leaf; Fig. 4 is asimilar .view of the filter in closed J position, and Fig. 5 is an enlarged view ofif one of the swing bolts on the eccentric shaft.

Referring to the drawings in detail, the; numeral 1 designates a semi-cylindrical cas-i ing member supported from above by the channel 2 and braces 3 and 4, the supporting members being omitted from Figs. 2, 3 and; 4 for the sake of clearness. A second semii cylindrical casing member 5 is attached to t e upper casing member by means of hinges 6 Cam shafts 6 are mounted in bearingsf 7 on both sides of the filter body. A p'lurality of swing bolts 8 are eccentrically mounted on the cam shafts. Each swing bolt carries a washer 9 andan adjusting nut 10. A corresponding plurality of pins 11 are set in the cam shafts on the same center Patented Jan. 6, 1914. Application filed April 12, 1913. .Serial No. 760,587. i

line and engage the pins 12 of the swing bolts. The function and operation of these parts will be described in detail below.

A plurality offilter plates orleaves 14 are suspended within thefilter' body. Each of these comprises a circular screen 15 having a casting riveted thereto, into which is firmly screwed the nipple 17 which has a side outlet 18. The cap 19 holds the filter plate in place by engaging the threaded end of the nipple17. By means of this cap the casting 16 is firmly seated against the recessed surface on the insideof the upper casing member. The filter plate is covered with' filter cloth 14 which forms the filtering medium. The opening 18 alines with the pipe-20 which has the valve 21 and connects with the filtrate pipe 22.

The cam shafts 6 are provided with the cranks 23 which are pinioned'to the connecting rods 24, in turn pinioned to the cross head 25 slidably mounted on the guides 26. The cross-head is -keyed to the piston rod 27 of the hydraulic cylinder 28 into which is i fitted the piston 2 9. The cylinder 28 is provided with an inlet pipe 30 at the top and inlet pipe 31 at the bottom. A second hydraulic cylinder 32 has its piston rod 33 pivoted .to the lower casing member '5 by means of the projecting arm 34. The iston 35 may be forced up or down to swing the casing member 5 open or closed by admitting a *fiuid under pressure through inlet 36 or '37 as the case may be. The 'asket38 which is inserted in a groove int e lower member 5 seals the joint when the sections 4 of filter body are closed.

through noziles 43. The pressure of the A pipe 41 entenng through stulfingbox fluid forces the'clear liquid content through the filter cloth 14 and it passes through the spaces formed between the wires of the screen and then upwardly through the casting 16, nipple 17, and aperture 18 into pipe 20, through valve 21 into pipe 22. The solid matter contained in the fluid deposits upon the filter cloth l4; in an even layer until the adjacent cakes of solid matter approach each other to within about one-half inch. The supply of fluid to be filtered is then discontinued and wash water simultaneously supplied through the pipe 41. There is no interruption to filtration during the change from sludge to wash water. When the cakes are'sufiiciently Washed, the supply of wash water is cut off and the small quantity of surplus wash water which occupies the space between the cakes is drawn ofl through pipe 39 and valve 40, or air may be forced through pipe 41, expelling surplus water through the porous cakes. The next step is to discharge the cakes from the filter leaves. Water under pressure is admitted to the cylinder 32-through pipe 37, which puts the piston rod 33 in. tension in readiness to hold the weight of the lower member 5. Water under-pressure is now admitted to cylinder 28, through pipe 30, forcing the cross-head 25 downward into the position indicated by the dotted lines in Fig. 1, thus rotating the shafts 6 through connecting rods 24. As the shafts revolve, the eccentric mounting of the bolts 8 causes them to drop away from the lugs 13. When the shafts revolve to a pointwhere the pins 11 engage the lugs 12, the bolts are caused to swing outwardly and assume the final position shown, leaving the lower member 5 supported only by its hinges 6 and the rod 33. The pressure below the piston in the cylinder 32 is now gradually released, permitting the member 5 to swing entirel open, as shown in Fig. 3. The cakes a hering to the filter cloths are now disengaged by introducing air, steam, or water pressure into the interior of the. leaves through pipe 22 and pipe20, the cakes falling from the filter into any convenient receptacle below. The filter may then be closed by introducing pressure into cylinder 32 through the pipe 37, and then into cylinder 28 through pipe 31, thus raising the cross-head 25 and rotating the shafts 6 so as to bring the bolts 8 back to a. vertical position to engage lugs 13. The bolts are then caused to tighten into place with the powerful leverage which the eccentric construction affords, and the two members of the filter are locked together to form a water-tight chamber ready to be filled again.

While I have illustrated and described only one specific embodiment of my invention, I realize that it is susceptible of broad application, and I 'do' not desire to be limsaid locking means, and means for controlling the movement of one of the parts of said casing.-

2. A filter press having a twopart casing, one of said parts being movable with relation to the other, a pluralityof means for locking said parts together mounted on the stationary part and adapted to engage the movable part, and means for simultaneously controlling the movement of said locking means.

3. A filter press having a two-part casing, one of said parts being movable with relation to the other, a plurality of means for locking said parts together mounted on the stationary part adjacent to the junction of said parts, and means for simultaneously controlling the movement of said locking means. v

4. A filter press having a two-part casing, one of said parts being movable wlth. relation to the other, means for locking said parts together comprising a plurallty of tension members mounted on one of said parts and having portions adapted to engage the other part, and means for simultaneously controlling the movement of said locking members.

5. A filter press having a two-part caslng, one of said parts being movable with relation to the other, means for looking sald parts together comprising a plurality of tension members mounted on the fixed part and having portions adapted to engage the movable part, and means for simultaneously controlling the movement of said tension members including a cam shaft and means on said locking members engaging said shaft.

6. A filter press having a two-part casing, one of said parts being movable with relation to the other, and means for locking said parts together including a locking member affixed to one of the parts and having a portion adapted to engage the other part. and means for controlling the movement of said locking member acting when said parts are in locked position to move said locking member longitudinally to release the stress therein, and then to withdraw it from engagement with said second-named part.

7. A filter press having a two-part'casing,

, one of said parts being movable with relation to the other, means for locking said parts together including a tension member tudinally' to release the tension therein and .then. to swing it out of engagement with said second-named part.

8. A filter press having a two-part casing, one of said parts being movable with relation to the other, means for. locking said parts together including a plurality of tension members mounted on one of said parts and having portions adapted to engage the other part, and means for simultaneously controlling the movement of said locking members acting when said parts are in locked position to move said locking members longitudinally to release the tension therein and then to swing them out of engagement With said second-named part.

9. A filter press having a two-part casing comprising a fixed section and a movable seotion means for locking said sections together including a pluralityof tension members mounted on one of said sections adja: cent to the junction of said sections and having portions adapted to engage the other section, and means for simultaneously controlling the movement of said locking members acting when said sections are in locked position to move said'locking members longitudinally to release the tension therein, and then to Withdraw them from engagement. with said second-named section.

10. filter press having a two-part casing comprising a fixed section and amovable section hinged thereto, and means for locking said parts together including a cam shaft mounted in fixed bearings and a plurality of tension members having portions engaging said cam shaft and portions adapted to engage the movable section and lock the same against the fixed section by rotation of said shaft.

- 11. A filter press having a two part casing comprising a fixed section and a movable section hinged thereto, and means for locking said parts together including a cam shaft, a plurality of locking members having portions adapted to engage the cam surfaces on said shaft, and portions adapted to engage said movable section and engaging means on said shaft, andmembers for causing the oscillation of said members about the shaft at afixed point in the rotation thereof independent. of the cam surfaces.

12. A filter press having a two-part casing, and means for locking said parts together including a cam shaft and a plurality of tension members having portions engaging said shaft and portions engaging (the casing and adapted to lock the same in operative position by movement of said cam shaft. a

13. A filter press having a two-part casing, and means for locking said parts in 0perative position including a cam shaft, a locking member engaging said shaft, and means for causing a movement of said member at a fixed point in the rotation of the cam shaft independent of the cam surface 'of said shaft.

ERNEST J. SWEETLAND.

Witnesses:

GERALD E. TERWILLIGER,

OLIVER WILLIAMS. 

